Question

why can a digital signal send a message over a very long distance more reliably than an analog signal?
a. the digital signal could easily lose information because of noise.
b. the digital signal is less vulnerable to noise and more likely to arrive intact.
c. the digital signal has waves that curve gradually and have many values.
d. the digital signal loses quality when copied over and over.

Explanation:

Digital signals are represented as discrete values (usually 0s and 1s). Noise in the transmission medium affects the amplitude of the signal. Since digital signals have only two distinct states, it is easier to distinguish between them even in the presence of noise. Analog signals, on the other hand, are continuous and can take on a range of values. A small amount of noise can distort the analog signal's amplitude, leading to loss of information. Option A is incorrect because digital signals are not easily affected by noise. Option C describes analog signals (which have continuous waveforms). Option D is incorrect as digital signals can be regenerated without loss of quality when copied (unlike analog signals which lose quality when copied).

Answer:

B. The digital signal is less vulnerable to noise and more likely to arrive intact.